Casting machine



1927. 1627 09s May 3' f J. ca. KoEGLE oAsTING MACHINE Filed June 17. .1926 "3 Sheets-Sheet 2 l QRAPHWE'# I L 4g A A. Hq 'j v Eq i 23.5

May 3, 1927.y y 1,627,098

A J. ci. Kol-:GLB

CASTING MACHINE F110? June 17. 1926 5 Sheets-SheetI 3 Patented May 3, 1927.

UNITEDl s'rATl-:s PATENT OFFICE.

JOHN G. KOEGLE, OF TOLEDO, OHIO, ASSIGNOR OF ONE-HALF TO IIUGO BOELTEROF TOLEDO, 01110.

CASTING MACHINE.

Application led June 17,

structed that the castings may be rapidlyv formed and removed and wherein-relatively soft iron castings, when iron castings are formed, may be produced having machinable parts or faces. The invention may be contained in struc tures of diferent forms `and to illustrate a practical application of the invention I have selected a structure containing ythe invention .as an illustration of such structures and shall describe it hereinafter." The structure selected is particularly applicable to casting valve heads forinternal combustion` engines and welding the heads to the stems in the casting operation. The invention also provides a stem structure whereby an etlicient weld may be made. A structure, selected as an example. of casting machines containing my invention, is shown in the accompanying drawings.

Figure 1 is a side View of the casting machine. Fig. 2 is a view lof a vertical section through the machine. Fig. 8 is a view ot' a section of a part ot' the casting head of the machine somewhat largerthan the proportionate sizes in Figs. 1 and 2, to 'show more accurately the details ot construction of the head of the casting machine. Fig. 4

is a view of the mold opened, a part of the lmold being shown broken away and parts removed, to show more in detailjthe .struc- Fig.` 5 illustrates a side view of a part ot the mold. Fig. 6 illustrates the manner in which the surplus metal that passes through the gates of the mold is severed from the casting. Fig. 7 4illustrates the drawn casting. Fig. Sillustrates aperspective viewV ofthe end of the stem that is welded to the valve head. Fig. 9 is a view of a section showing the withr drawal of the portion that forms the lower side of a matrix of the mold. Fig. 10 illustrates'the position of the end of thestem relative to a matrix when in position to be` welded to the head in the casting operation.

The casting machine may be provided with a suitable base 1. Thecasting Amachine head or mold 2 is supported on the basel by suitable uprightsv or` pedestals "such as the rods 3. The mold 2 comprises two parts 4 and 5` that are Vhngedly connected by 1926.- serial No. 116,603.

means of the pintle or rod 6. The part'4 is connected to the rodsv 3 whilethe part 5 1s swung relative to the part 4 by means of a suitable handle, such as, a handle 7, to open and close the mold.

' The parts 4 and 5 have registering recesses 8 and 9 that, when the parts are closed, form the matrices of the mold. The part 5 has ythe sprue hole 10 having a conical surface.

The gate-ways formed by the recesses 11 connect a sprue hole 10 with the recesses 9 formed in the part 5. A cone 12 is secured to the part 4 by means of a bolt 13. The apex of the cone islocated substantially in the axis of the sprue hole 10. The cone 12 closes one side of each of the recesses 11v which consequently form the gateways between the sprue hole andthe cavities of the mold-when the parts 4 andv 5 areclosed and so that when metal` is poured into the sprue hole 10 it will'flow down'the surface of the cone 12 through the gates and into the matrices of the mold.

Since the machine is for forming valves for internal combustion engines, means is provided for properly locating the ends ofV the rods that form the stems of the valves within the matrices of the molds so that they may be welded to the valve heads in the casting of theheads. The'machine is provided witha. plate 16 that is adjustably supported with reference to the part 4 ofthe mold for supporting the stems in positionwhile the V valve heads are cast; The plate 16 may be threaded on vto the rod 17 that is longitudinally'movable ina boss v18 that may be cast integral with the base 1 of the machine.

The rod 17 is provided with a rack 19 and a sector 20 may be pivotally connected to the base 1such as in the boss 18, 'for raisingand lowering the rod 17 by the operation of the sector 20. A lever 21 may be connected to the sector 201er operating the disc. Thus the plate 16 maybe adjustably located with reference tothe mold and may bey raised and loo lowered as'may be desired in 'order tormatermined bythe rac-lr 19 and ,the lsector 2Q the upper ends ot the rods 24 Willbe located centrally with respect to the matrices of the mold. When, therefore, the metal is poured it Will surround the upper ends of the rods- In order that the ends of the rods vmay be brought up to a Welding heat, ,so that when the valve heads are cooled, the heads and the rods will be Welded into Lan intogral structure, means is provided for allowing a certain. amount ,of the metal to iiow into and through Athe .matrices ,of the mold to convey to the rods the required Welding' heat.. The part 5 thus provi-ded with cavities 26 that communicate with the matrices of the vmolds and which Will be filled to a more or less extent by 4the surplus metal that is Lused for heating the rods. The cavities 26 also provide for the removal of the first metal that enters the matrices which notonly heats the' rod but also heats the surface of the matrices` and leaves Within the matrices, possibly, `a better metal than would otherwise occur Where castings lare formed oit iron or brass. The

.i immediate preheating` oa" `the surfaces of the matrices by the molten metal that is directed into the matrices and then removed by entrance into the cavities, produces relatively soft castings ,having surfaces that may be machined.

rlhe portion of 'the `metal that enters .the cavities 26 may, While the metal is still sott, be severed from the metal that forms the valve heads. In order thatthis .may be done the part 5 is provided With aV channel in which a ring 28 is .located andthe Icavities ,26 are formed the vring,` 28. The part A5 is also provided with a vplurality 4of holes 29 that communicate with the matrices ,that 4are forme-d by-the recesses y8 and 9. 'Ighe ring 28 is so located inthe lpart 5 that the lower ends of the cavities `26 may register'withthe openings 29 and so that the cavities-may receive the metal from the ,matrices of vthe mold. The part `5 is also ,provided tvitha slot 30 that extends through its side to the channel 27 and a. rod 31 is secured in the ringe' 28 4and extends through the slot J30. While the metal in lthe cavities 26 is soft, the rod 31 .may be moved, along` the slot 30 so as `to cut oli' the ,connection between the metal in the cavities 26 and the metal in the matrices of the mold. The eavities 26 have inverted `cone -surfaces so that when the part- 5 is turned over by a .pivotal movement on the rod 6 the metal in the cavities .2 6 are dropped out.

In order to produce a ,fine grain casting the matrices otthe .mold may be ,provided with suitable lining-js y.oflrefractory material, ii2 desired, or suitable chills may be located where it is desired to produce ichill vcastings or chilled'portions of .the castings. A,In the machine selected Vfor purposes ot illustration for castingvalvesit is found ,desirable lto Vthe valves 32 that come in contact With their seats may be formed of a soft fine grain metal that may be machined or ground to fit the seats uthat they cooperate with whenV they are placed in vposition in the engines in connection with which they are to be used. Thepart l is thus recessed 4s o as to receive the graphite rings 34e Which have bevelled edges 35 that conform to `the bevelled portions 4of the valves.

In order that .the valves may be readily drawn from the mold, on .the completion of the casting;- they jare' preferably loosened. This may be done when the rod 1f? is lowered bythe operation lofthe sector 20. Theupper end of ther-od 17 is .connected to a plate 3 6 through which fthe rods 3 extend. The rods 3 operate .to .guide the plate 36 then xmoved by the rod 17.A It desired springs 37 may be located on ,the rods 3 to counterfbalance the Weight ,of the plate 36 and the rods 17 and .to normally .force the' plate 36 upwards. The plate 36 is provided with .a plurality of sleeves 3,8 in which the rods 241, that `form the stems oi' .the valves, are located.V The upper ends of the sleevesSB are flared outward form the lower surfaces of the matrices of lthe' mold. The sleeves 38 may extend through vthe plate 36 and be secured in pnsition py .means of nuts 3,9. The uoper edges lo Vthe sleeves 38 are elasticallylheld by zintea'zns ot the Lsprings 13 into contact -With a ,conical .surface 10 formed on the 4graphitic IiiiigsA 3ft. The springs 43 4thus operate Ato c lose .this portion 'of each matrix of Athe mold.

In order to reduce vthe chilling action of therods v2.4 theyare inserted in the sleeves 3,8. The ,sleeves v3S may `b egheated by electric Sii resistance Wires 43 that are'fpreferably '10# cated on sleeues of insulating material 411 Vthat surround the sleeves 38. The 'resistance vvires 43 will when connected toV a source of supply o electric current Amaintain the sleeves 38 at a high vvtemp erature,and Will consequently raise the temperature of the 10ds24 that forlnthe Stems' of the valve to a high temperature and so that ythe metal that enters Et e matrices IWillnothe cooled atan undesired rate. The resistance Wires more over operate :to heat to a high temperature, the portions of the mold that surround Vthe matrices. 'This enables the" productionl of soft castings in :the ymolds While the spaces between Lthfeupper endsofthe sleeves 38 and the Vgraphitic rings 361 vprovides for the vescape' Aof gases that may be formed Within the matrices of thermo'ld or Athat may be created liv Orbe {exudd -cfr'om the molten :metal withV the result that exceedingly line and substantially perfect castings are formed by the machine. Preparatory to forming the castings in the machine, it is found preferable to heat the entire machine to a high temperature by a suitable heating means such as a blow torch, or, if desired, substantially the same results may be obtainedby making a few castings and throwing them away, if imperfect, until the temperature of the mold is raised sufficiently Vhigh to produce the desired structural iron in the castings in the continued use of the machine. By making castings repeatedly and with reasonable rapidity it will maintain the mold at the proper high temperature, 'particu- :i larly, where the resistance wires 43 are used the overflow of metal, that is, in order thaty the ends of the rods 24 may be readily brought to a welding heat by the use of a relatively small amount of additional metal` the ends of the rods are split into two or more tongues. Preferably, the laterally eX- tending tongues 47 are formed about a central core or projection 48 that is located within the matrices of the mold. The subdivision of the ends of the rods into tongues increases the area of contact with the molten metal proportionate to the quantity of iron in the ends of the rods which quickly raises the temperature to the necessary luXing or welding point and moreover produces a more positive union between the parts. Furthermore, if the contraction rate of the head and rod should differ, the rod nevertheless will remain interlocked in the head.

I claim:

l. In a casting machine, a mold having two parts, one of the parts having a non-inverted cone shaped sprue hole and recesses forming the gateways and a side of each of the matrices of the mold, the other part. for closing one side of each of the recesses that form the gateways and having recesses that with the other of the said recesses of the first. named part form the matrices of the c mold.

2. In a casting machine, a mold having two parts, one of the parts having a noninverted cone shaped sprue hole vand recesses forming the gateways and a side of each of the matrices of the mold, the other part for closing one side of eac-h of the recesses that form the gateways and having recesses that with the other of the said recesses of the first named part form the matrices of the mold, a member slidably connected to one of the parts and having cavities communicating with the matrices.

3. In a casting machine, a vmold having p two parts, one of the parts having a noninverted cone shaped sprue hole and recesses forming the gateways and a side of each of the matrices of the mold, the other part for closing one side of each of the recesses that form the gateways and having recesses that with the other of the said recesses of the lfirst named part form the matrices of the mold, a ring slidably connected to one of the parts and having cavities communicating with the matrices.

4. In a casting machine, a mold having two parts, one of the parts having a noninverted cone shaped sprue hole and re-l cesses forming the gateways and a side of each of the matrices-of the mold, the other part for closing one side of each of the re- Y JOHN G. KOEGLE. 

